Does the Trunk Provide Heat Insulation in Summer?
3 Answers
Generally, car trunks do not offer heat insulation during summer. Here are some methods for vehicle heat insulation: Apply window films: High-quality car films can effectively block sunlight and UV rays. Therefore, to better shield against direct sunlight while driving, opt for genuine window films with strong UV protection. Install sunshades: Hanging sunshades on windows can block most sunlight; the thicker the sunshade, the better the effect. Pre-cooling measures: Taking preventive steps to cool the car can prevent excessive interior temperatures. Park in shaded and ventilated areas. When parking, drivers should avoid leaving the vehicle directly under the sun, such as choosing spots under trees in parking lots.
In summer, I often find the stuff in my trunk gets as hot as an oven, especially after parking under the scorching sun—even bottled water turns scalding. Standard car trunks actually lack dedicated heat insulation design; the metal shell heats up quickly, and the AC airflow doesn’t reach there. I once measured with a thermometer: when the cabin hits 30°C under intense sunlight, the trunk can soar past 50°C! This causes multiple issues: food spoils faster, and power banks may even pose explosion risks. So now I minimize storing perishables, cover the trunk area with a sunshade before driving, or use professional car insulation pads—they work decently. If you’re into road trips, regularly checking the vehicle’s sealing strips also helps reduce heat intrusion. Bottom line: poor trunk insulation is a common flaw, but small preventive measures make a big difference.
When it comes to summer trunk insulation, I believe the key lies in material construction. Most car trunks are made of sheet metal shells, and metal conducts heat quickly. After being exposed to the scorching sun, heat penetrates rapidly, while the internal cotton padding or plastic liners are not very effective. The air conditioning system only takes care of the cabin, with no airflow reaching the trunk. Here's how I usually handle this: I park in shaded areas, preferably under trees or in underground garages; when storing items, I wrap them in insulated bags, such as those made of silver reflective material; and I regularly clean the trunk, as accumulated dust absorbs more heat. High temperatures can also accelerate the aging of items, so avoid leaving electronic devices or flammable materials carelessly. These small habits, when accumulated, can significantly reduce risks and make travel more reassuring.
